B.A.C. BACtrack Manuel Du Propriétaire page 8

Step 2. On your mobile
device, press the "Take
a Reading." button. A
countdown clock appears
while the sensor in the
breathalyzer warms up.
ENG-12.
Step 3. When the screen
on your mobile device reads,
"Blow now," take a deep
breath, and blow into your
BACtrack Mobile Breathalyzer
continuously until all the bars
are illuminated. It should take
about five seconds, and you
might hear a click towards the
end - that's the air pump
pulling air across the sensor.
ENG-13.